---
acl_categories:
- '@admin'
- '@slow'
- '@dangerous'
arity: 1
categories:
- docs
- develop
- stack
- oss
- rs
- rc
- oss
- kubernetes
- clients
command_flags:
- admin
- noscript
- loading
- stale
description: Listens for all requests received by the server in real-time.
group: server
hidden: false
linkTitle: MONITOR
railroad_diagram: /images/railroad/monitor.svg
since: 1.0.0
summary: Listens for all requests received by the server in real-time.
syntax_fmt: MONITOR
title: MONITOR
---
`MONITOR` is a debugging command that streams back every command processed by
the Redis server.
It can help in understanding what is happening to the database.
This command can both be used via `redis-cli` and via `telnet`.

The ability to see all the requests processed by the server is useful in order
to spot bugs in an application both when using Redis as a database and as a
distributed caching system.

```
$ redis-cli monitor
1339518083.107412 [0 127.0.0.1:60866] "keys" "*"
1339518087.877697 [0 127.0.0.1:60866] "dbsize"
1339518090.420270 [0 127.0.0.1:60866] "set" "x" "6"
1339518096.506257 [0 127.0.0.1:60866] "get" "x"
1339518099.363765 [0 127.0.0.1:60866] "eval" "return redis.call('set','x','7')" "0"
1339518100.363799 [0 lua] "set" "x" "7"
1339518100.544926 [0 127.0.0.1:60866] "del" "x"
```

Use `SIGINT` (Ctrl-C) to stop a `MONITOR` stream running via `redis-cli`.

```
$ telnet localhost 6379
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
MONITOR
+OK
+1339518083.107412 [0 127.0.0.1:60866] "keys" "*"
+1339518087.877697 [0 127.0.0.1:60866] "dbsize"
+1339518090.420270 [0 127.0.0.1:60866] "set" "x" "6"
+1339518096.506257 [0 127.0.0.1:60866] "get" "x"
+1339518099.363765 [0 127.0.0.1:60866] "del" "x"
+1339518100.544926 [0 127.0.0.1:60866] "get" "x"
QUIT
+OK
Connection closed by foreign host.
```

Manually issue the [`QUIT`]({{< relref "/commands/quit" >}}) or [`RESET`]({{< relref "/commands/reset" >}}) commands to stop a `MONITOR` stream running
via `telnet`.

## Commands not logged by MONITOR

Because of security concerns, no administrative commands are logged
by `MONITOR`'s output and sensitive data is redacted in the command [`AUTH`]({{< relref "/commands/auth" >}}).

Furthermore, the command [`QUIT`]({{< relref "/commands/quit" >}}) is also not logged.

## Cost of running MONITOR

Because `MONITOR` streams back **all** commands, its use comes at a cost.
The following (totally unscientific) benchmark numbers illustrate what the cost
of running `MONITOR` can be.

Benchmark result **without** `MONITOR` running:

```
$ src/redis-benchmark -c 10 -n 100000 -q
PING_INLINE: 101936.80 requests per second
PING_BULK: 102880.66 requests per second
SET: 95419.85 requests per second
GET: 104275.29 requests per second
INCR: 93283.58 requests per second
```

Benchmark result **with** `MONITOR` running (`redis-cli monitor > /dev/null`):

```
$ src/redis-benchmark -c 10 -n 100000 -q
PING_INLINE: 58479.53 requests per second
PING_BULK: 59136.61 requests per second
SET: 41823.50 requests per second
GET: 45330.91 requests per second
INCR: 41771.09 requests per second
```

In this particular case, running a single `MONITOR` client can reduce the
throughput by more than 50%.
Running more `MONITOR` clients will reduce throughput even more.

## Behavior change history

*   `>= 6.0.0`: [`AUTH`]({{< relref "/commands/auth" >}}) excluded from the command's output.
*   `>= 6.2.0`: "[`RESET`]({{< relref "/commands/reset" >}}) can be called to exit monitor mode.
*   `>= 6.2.4`: "[`AUTH`]({{< relref "/commands/auth" >}}), [`HELLO`]({{< relref "/commands/hello" >}}), [`EVAL`]({{< relref "/commands/eval" >}}), [`EVAL_RO`]({{< relref "/commands/eval_ro" >}}), [`EVALSHA`]({{< relref "/commands/evalsha" >}}) and [`EVALSHA_RO`]({{< relref "/commands/evalsha_ro" >}}) included in the command's output.

## Redis Software and Redis Cloud compatibility

| Redis<br />Software | Redis<br />Cloud | <span style="min-width: 9em; display: table-cell">Notes</span> |
|:----------------------|:-----------------|:------|
| <span title="Supported">&#x2705; Standard</span><br /><span title="Supported"><nobr>&#x2705; Active-Active</nobr></span> | <span title="Supported">&#x2705; Standard</span><br /><span title="Supported"><nobr>&#x2705; Active-Active</nobr></span> |  |

## Return information

{{< multitabs id="monitor-return-info" 
    tab1="RESP2" 
    tab2="RESP3" >}}

**Non-standard return value**. Dumps the received commands in an infinite flow.

-tab-sep-

**Non-standard return value**. Dumps the received commands in an infinite flow.

{{< /multitabs >}}